<template>
    <div class="app-container">
           <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name"/>
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" controls-position="right"/>
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level" clearable placeholder="请选择">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
          -->
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="2" label="首席讲师"/>
        </el-select>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career"/>
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" :rows="10" type="textarea"/>
      </el-form-item>
      <!-- 讲师头像：TODO -->
      <!-- 讲师头像 -->
      <el-form-item label="讲师头像">

          <!-- 头衔缩略图 -->
          <pan-thumb :image="teacher.avatar"/>
          <!-- 文件上传按钮 -->
          <el-button type="primary" icon="el-icon-upload" @click="imagecropperShow=true">更换头像
          </el-button>

          <!--
            v-show：是否显示上传组件
            :key：类似于id，如果一个页面多个图片上传控件，可以做区分
            :url：后台上传的url地址
            @close：关闭上传组件
            @crop-upload-success：上传成功后的回调 
                <input type="file" name="file"/>
        -->
          <image-cropper
                        v-show="imagecropperShow"
                        :width="300"
                        :height="300"
                        :key="imagecropperKey"
                        :url="BASE_API+'/eduoss/fileoss/upload'"
                        field="file"
                        @close="close"
                        @crop-upload-success="cropSuccess"/>
      </el-form-item>
      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存</el-button>
      </el-form-item>
    </el-form>
    </div>
</template>

<script>
//引入teacher.js, .js可省略
import teachers from "@/api/edu/teacher"
import ImageCropper from "@/components/ImageCropper"
import PanThumb from "@/components/PanThumb"
export default {
    components: {ImageCropper, PanThumb},
    data(){
        return{
            teacher:{
                name:'',
                sort: 0,
                level: 1,
                career: '',
                intro: '',
                avatar: ''
            },
            saveBthDisabled: false, //保存按钮是否禁用
            //上传弹框组件是否显示
            imagecropperShow: false,
            imagecropperKey: 0,
            BASE_API: process.env.BASE_API //获取dev.env.js中的地址
        }
    },
    created(){//只会执行第一次
        this.init()
    },
    watch:{//vue的监听功能
        $route(to, from){//路由发生变化就执行该方法
            this.init()
        }
    },
    methods:{
        saveOrUpdate(){
            //添加
            if(!this.teacher.id){
                this.saveTeacher()
            }else{
                this.updateTeacher()
            }
            
        },
        updateTeacher(){
            teachers.updateTeacherInfo(this.teacher)
                .then(response =>{
                    this.$message({
                    type: 'success',
                    message: '修改成功！'
                    });
                    //回到列表界面，路由跳转
                    this.$router.push({path: '/teacher/list'})
                })
        },
        saveTeacher(){
            teachers.addTeacher(this.teacher)
                .then(response =>{
                    this.$message({
                    type: 'success',
                    message: '添加成功！'
                    });
                    //回到列表界面，路由跳转
                    this.$router.push({path: '/teacher/list'})
                })
        },
        getInfo(id){
            teachers.getTeacherInfo(id)
                .then(response =>{
                    this.teacher = response.data.teacher
                })
        },
        init(){
            if (this.$route.params && this.$route.params.id) {
                const id = this.$route.params.id // 从路径中得到id值
                this.getInfo(id)
            }else{
                this.teacher = {}
            }
        },
        close(){ //关闭上传弹框
            this.imagecropperShow = false
            // 上传组件初始化
            this.imagecropperKey = this.imagecropperKey+1
        },
        cropSuccess(data){//上传成功方法
            this.imagecropperShow = false
            this.teacher.avatar = data.path
            this.imagecropperKey = this.imagecropperKey+1
        }
    }
}
</script>